| SIGA, 
 Exercise of 150,000 stock options at 3.10 by CFO:
 
 SEC Form 4 FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
 Washington, D.C. 20549
 
 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP
 
 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940 OMB APPROVAL
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 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
 1. Name and Address of Reporting Person* KONATICH THOMAS N
 
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 (Last) (First) (Middle)
 C/O SIGA TECHNOLOGIES, INC.
 420 LEXINGTON AVENUE, SUITE 408
 
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 (Street)NEW YORK NY 10170
 
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 (City) (State) (Zip)
 2. Issuer Name and Ticker or Trading Symbol
 SIGA TECHNOLOGIES INC [ SIGA ]  5. Relationship of Reporting Person(s) to Issuer
 (Check all applicable) Director  10% Owner
 X Officer (give title below)  Other (specify below)
 Chief Financial Officer
 
 3. Date of Earliest Transaction (Month/Day/Year)
 07/26/2007
 4. If Amendment, Date of Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person
 Form filed by More than One Reporting Person
 
 Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
 1. Title of Security (Instr. 3)  2. Transaction Date (Month/Day/Year)  2A. Deemed Execution Date, if any (Month/Day/Year)  3. Transaction Code (Instr. 8)  4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)  5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)  6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)  7. Nature of Indirect Beneficial Ownership (Instr. 4)
 Code V Amount (A) or (D) Price
 Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
 (e.g., puts, calls, warrants, options, convertible securities)
 1. Title of Derivative Security (Instr. 3)  2. Conversion or Exercise Price of Derivative Security  3. Transaction Date (Month/Day/Year)  3A. Deemed Execution Date, if any (Month/Day/Year)  4. Transaction Code (Instr. 8)  5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)  6. Date Exercisable and Expiration Date (Month/Day/Year)  7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)  8. Price of Derivative Security (Instr. 5)  9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)  10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)  11. Nature of Indirect Beneficial Ownership (Instr. 4)
 Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
 Stock Option (Right to buy) $3.1 07/26/2007  A  150,000  ( 1 )  07/26/2017 Common Stock, par value $.0001 per share 150,000 $0 695,000 D
 Explanation of Responses:
 1. The options with respect to 100,000 shares will vest pro rata on the first, second and third anniversaries of the date of grant. The options with respect to the remaining 50,000 shares will vest upon achievement of certain milestones.
 Remarks:
 
 /s/ Thomas N. Konatich  07/30/2007
 ** Signature of Reporting Person Date
 Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
 * If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
 ** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
 Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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